Interpreting Step Rate Tests SRTs in Multi-Layered, Unconsolidated and Stress-Sensitive Formations
- Iraj Ershaghi (Univ. of Southern California) | Milad A. Ershaghi (Consultant)
- Document ID
- Society of Petroleum Engineers
- SPE Western Regional Meeting, 22-26 April, Garden Grove, California, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- 5 Reservoir Desciption & Dynamics, 3 Production and Well Operations, 3 Production and Well Operations, 5.4 Improved and Enhanced Recovery
- injection gradient, stress sensitive, waterflood, step rate test, multi layer
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- 161 since 2007
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We studied the applicability of Step Rate Tests (SRTs) for estimation of suitable injection gradients and reviewed various diagnostic plots to examine their relationship with injection rate and pressure. While dealing with multi-layered systems and those consisting of unconsolidated formations and examining the causes of injection increase seen, we identified some shortfalls associated with the SRT procedure. We also examined the force balance of formation response to injection gradients and concluded that formation resistance to water injection changes with time. That means the injection gradient to maintain constant injectivity is affected by the near wellbore conditions and as such, has a dynamic nature and can change with time. For unconsolidated formations, changes in pore pressure may also affect the rock effective permeability which alone can influence the required injection gradients.
|File Size||1 MB||Number of Pages||13|
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